UDN: Use managedTap instead passt

[oshoval]

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[oshoval]

Hi @qinqon @maiqueb
once we want, we can switch to managedTap here (and then on CNAO when it tests it upstream as well)
almost just tests are changed on CNAO / here
(CNAO will also register only on upstream the binding / FGs via its upstream deployment scrips)

[RamLavi]

/lgtm